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79 Multiple choice questions

1. Conventional current =
2. is the ratio of the charge to the potential difference of the plates
3. Unit for potential difference is the
4. Req=(1/Ra +1/Rb...)^-1
5. variable for resistance
6. The plates become charged by connecting them to a source of
7. unit for EMF
8. EMF
9. A charged capacitor stores
10. is the displacement from reference point
11. control the amount of current in a conductor
12. -sum up I
13. is the change in electric potential
14. Higher temperature =
15. -Req> any R of a device
16. Ohm's law only applies to materials that have constant resistance - called
17. ∆V = ∆PEelectric/q
18. V = IR
19. point charges are not____ because their field weakens at a distance
20. variable for current
21. Greater area =
22. a unit of energy, energy 1 electron gains when moved through a potential difference of 1V.
23. lower the body's resistance
24. Negative charges inside the battery move from the ___ terminal to the ____
25. net velocity of the charge carriers, very small (~25mm/s)
26. device used to store electric potential energy
27. is the rate of charge transfer
28. no change in PE, no
29. Power companies measure energy usage in
30. variable for potential difference
31. Potential energy associated with the interaction of charges
32. -one path
33. variable for joule
34. Changing the____ between the plates of a capacitor will change how much charge it can hold
35. variable for volt
36. Movement of electric charge
37. terminals causing potential difference are constantly changing sign, causes charges to just vibrate back and forth rather than flow
38. Potential difference maintains ____ in a circuit
39. Whenever a charge is moved by another charge's electric field force,____ is done
40. Current motion is actually made up of positive, negative or movement of both - called
41. discovered that animals conduct electricity - frog legs twitched when conducting electrical experiments near the frog
42. Longer material =
43. variable for ampere
44. When the plates are charged, the capacitor is said to be
45. unit for capacitance
46. no PE for
47. Mechanical energy is conserved as long as there is
48. Capacitors made with a _____ between the plates hold more charge - this book assumes vacuum between plates
49. SI unit for electrical energy is
50. in the conductor move along a zig-zag due to their vibrations - causes collisions and energy transfer
51. When a charge is moved in a uniform electric field, the change in location relates to a change in
52. is the potential energy associated with a charge in an electric field
53. rate of energy conversion
54. -Req= Ra+Rb+Rc....
55. Resistance is____ over a range of potential differences
56. unit for resistance
57. a type of resistor that allows the user to change the potential difference across a conductor - used on volume control knobs, dimmer light switch, video game controllers
58. electrons move in one direction, from low electric potential to high electric potential (remember conventional current is flow of positive charge) - conventional current moves from positive terminal to negative terminal
59. The negative sign means that the PE will ____ when the charge is negative and ______ when the charge is positive
60. Once a capacitor is charged it will remain so until
61. -2 or more paths
62. energy storage unit that maintains a constant potential difference between two locations called terminals
63. No work is done when a charge is moved _____ to an electric field, and the PEelectric remains constant
64. Work done to move the charge is a measure of the
65. -constant I
66. Electrons move ____ through a conductor in the opposite direction from the electric field - however E reaches the electrons at nearly c
67. Free electrons in a conductor move from areas of ___ electric potential to areas of ___ electric potential
68. variable for electrical energy
69. unit for electric power
70. Opposition of the motion of charge through a conductor
71. -Req< any components resistance
72. is the permittivity in a vacuum, which is 8.85x10-12 C2/(Nm2)
73. Electric potential energy is a form of
74. variable for ohm
75. When discharged, the charges move between the plates until the potential difference is
76. -constant V
77. -sum up V
78. is the permittivity of the material,
79. unit for current